/*
* Copyright 2006-2014 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.batch.sample.domain.trade.internal;
import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.List;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.batch.core.annotation.AfterWrite;
import org.springframework.batch.item.ExecutionContext;
import org.springframework.batch.item.ItemStreamSupport;
import org.springframework.batch.item.ItemWriter;
import org.springframework.batch.item.WriteFailedException;
import org.springframework.batch.sample.domain.trade.Trade;
import org.springframework.batch.sample.domain.trade.TradeDao;
import org.springframework.util.Assert;
/**
* Delegates the actual writing to custom DAO delegate. Allows configurable
* exception raising for testing skip and restart.
*/
public class TradeWriter extends ItemStreamSupport implements ItemWriter<Trade> {
private static Log log = LogFactory.getLog(TradeWriter.class);
public static final String TOTAL_AMOUNT_KEY = "TOTAL_AMOUNT";
private TradeDao dao;
private List<String> failingCustomers = new ArrayList<String>();
private BigDecimal totalPrice = BigDecimal.ZERO;
@Override
public void write(List<? extends Trade> trades) {
for (Trade trade : trades) {
log.debug(trade);
dao.writeTrade(trade);
Assert.notNull(trade.getPrice()); // There must be a price to total
if (this.failingCustomers.contains(trade.getCustomer())) {
throw new WriteFailedException("Something unexpected happened!");
}
}
}
@AfterWrite
public void updateTotalPrice(List<Trade> trades) {
for (Trade trade : trades) {
this.totalPrice = this.totalPrice.add(trade.getPrice());
}
}
@Override
public void open(ExecutionContext executionContext) {
if (executionContext.containsKey(TOTAL_AMOUNT_KEY)) {
this.totalPrice = (BigDecimal) executionContext.get(TOTAL_AMOUNT_KEY);
}
else {
//
// Fresh run. Disregard old state.
//
this.totalPrice = BigDecimal.ZERO;
}
}
@Override
public void update(ExecutionContext executionContext) {
executionContext.put(TOTAL_AMOUNT_KEY, this.totalPrice);
}
public BigDecimal getTotalPrice() {
return totalPrice;
}
public void setDao(TradeDao dao) {
this.dao = dao;
}
/**
* Public setter for the the customers on which failure should occur.
*
* @param failingCustomers The customers to fail on
*/
public void setFailingCustomers(List<String> failingCustomers) {
this.failingCustomers = failingCustomers;
}
}